CN113714670A - Vertical butt joint lowering method for expansion pipe - Google Patents
Vertical butt joint lowering method for expansion pipe Download PDFInfo
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- CN113714670A CN113714670A CN202110927770.0A CN202110927770A CN113714670A CN 113714670 A CN113714670 A CN 113714670A CN 202110927770 A CN202110927770 A CN 202110927770A CN 113714670 A CN113714670 A CN 113714670A
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- expansion pipe
- centering device
- welding
- clamping
- shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0533—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor external pipe alignment clamps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
- B23K37/04—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work
- B23K37/053—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor
- B23K37/0538—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups for holding or positioning work aligning cylindrical work; Clamping devices therefor for rotating tubes, e.g. rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
Abstract
A method for vertically butting and lowering an expansion pipe comprises the following steps: mounting and fixing equipment; lowering the expansion pipe; the centering device is fixed with the lower expansion pipe; the centering device is fixed with the upper expansion pipe; welding an upper expansion pipe and a lower expansion pipe; and (5) lowering the welded expansion pipe. Compared with the prior art, the method can improve the welding efficiency of the expansion pipe, ensure the stability of the welding effect, and has more outstanding advantages when the hull is always in a fluctuating state under the action of sea waves particularly for offshore operation. The centering device designed according to the appearance characteristics of the quincunx expansion pipe can accurately and rigidly connect the upper expansion pipe and the lower expansion pipe and can assist in realizing the circumferential 360-degree welding of the expansion pipes. The method has the characteristics of low investment cost, high working efficiency and easy implementation.
Description
Technical Field
The invention relates to a drilling construction method, in particular to a vertical butt joint lowering method for an expansion pipe.
Background
The wall protecting technology for expansion pipe is that in the course of drilling construction, the expansion pipe is put into the well bottom, and the expansion pipe is permanently deformed by means of hydraulic or mechanical force and suspended and fixed with the hole wall, so that the well body structure is optimized, the falling and collapse of the well wall are prevented, and the high-pressure layer or low-pressure leakage layer is blocked. Welding is the primary joining technique for expansion pipes. At present, the connection construction of expansion pipes is still in a manual welding stage, when the distance of a wall protection hole section is long, and a plurality of expansion pipes need to be put in for wall protection, the expansion pipes need to be welded one by one, manual welding is adopted, the labor intensity is high, the working efficiency is low, and the welding effect is unstable. In the prior art, a welding trolley is adopted to rotate along a pipe in the petroleum field, the pipe body is fixed in a fixed welding mode, a track is fixed on the pipe body with the 8-shaped cross section, and the diameter of the pipe body is small, so that the load of a conventional welding gun and an actuating mechanism cannot be borne, and therefore a customized micro welding actuating mechanism and a customized welding gun are needed. This welding method is not suitable for an expansion pipe with a quincunx section.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a vertical butt joint and lowering method for expansion pipes, which has reliable butt joint quality of the expansion pipes, high working efficiency and easy realization.
The problem of the invention is realized by the following technical scheme:
the vertical butt joint lowering method for the expansion pipe comprises the following steps:
a. equipment installation: a fixed table is built at a wellhead into which an expansion pipe needs to be put, a rotating body and a welding robot are installed on the fixed table, the welding robot is located beside a position changing machine, a lower expansion pipe clamp is assembled on the position changing machine, a lifting mechanism is arranged on the upper portion of the position changing machine, and the lifting center of the lifting mechanism is coaxial with the rotating center of the position changing machine;
b. lowering a lower expansion pipe: the lifting mechanism lifts the lower expansion pipe, the lower expansion pipe is lowered into the well through the lower expansion pipe clamp, the upper portion of the lower expansion pipe corresponds to the welding height position of the welding robot, the lower expansion pipe is clamped by the casing slip, and the casing slip is supported by the lower expansion pipe clamp;
c. the centering device is fixed with the lower expansion pipe: sleeving a centering device on the upper part of the lower expansion pipe, wherein the centering device is provided with a shell, a welding window is arranged on the shell, the welding window of the centering device corresponds to the welding robot, clamping mechanisms are respectively arranged at the upper part and the lower part in the shell of the centering device, the upper part of the lower expansion pipe is clamped by the clamping mechanism positioned at the lower part, and the rotation of the lower expansion pipe relative to the centering device is limited by a torque transmission pin;
d. the centering device is fixed with the upper expansion pipe: the lifting mechanism lifts the upper expansion pipe and puts the upper end of the lower expansion pipe through the centering device, the wave crest and wave trough positions of the upper expansion pipe and the lower expansion pipe correspond to each other, the clamping mechanism positioned at the upper part clamps the lower part of the upper expansion pipe and the torque transmission pin limits the rotation of the upper expansion pipe relative to the centering device;
e. welding an upper expansion pipe and a lower expansion pipe: starting a position changing machine to rotate, driving the upper expansion pipe, the lower expansion pipe and the centering device to synchronously rotate by the position changing machine, and welding the joint of the upper expansion pipe and the lower expansion pipe at the welding window by a welding robot; after the upper expansion pipe and the lower expansion pipe are welded for one section, the positioner stops rotating, the torsion transmission pin is pulled out, the torsion transmission pin is contacted to restrain the rotation of the upper expansion pipe and the lower expansion pipe relative to the centering device, the shell is pushed to rotate relative to the upper expansion pipe and the lower expansion pipe, the welding window corresponds to the welding robot again, the upper torsion transmission pin is inserted, the positioner is started again, the positioner drives the upper expansion pipe and the lower expansion pipe to rotate to continue welding, and the upper expansion pipe and the lower expansion pipe are welded until the whole circumferential seam of the upper expansion pipe and the lower expansion pipe are welded together;
f. and (3) lowering the expansion pipe which is welded: and d, after welding is finished, removing the clamping blocks of the upper clamping mechanism and the lower clamping mechanism, separating the upper expansion pipe and the lower expansion pipe from the centering device, dropping the centering device on a bracket of the centering device, putting the welded upper expansion pipe and the welded lower expansion pipe down, and repeating the step d and the step e until the upper expansion pipe is put down to a welding position to weld the next expansion pipe.
According to the method for vertically butting and lowering the expansion pipe, the expansion pipe is in a quincunx shape in section, and a plurality of wave crests and wave troughs are uniformly distributed on the outer wall of the expansion pipe along the axial direction; the shell of the centering device is in a three-section type, the upper section and the lower section of the shell are cylindrical, inner holes of the upper section and the lower section of the shell are stepped holes, the middle section of the shell is in an arc groove shape, a welding window is arranged in the middle section of the shell, two sets of clamping mechanisms are respectively arranged on the upper section and the lower section of the shell, each set of clamping mechanism is respectively provided with two sets of bearings, an inner sleeve, a clamping block and a support ring, the support ring is in contact pressure with a step in the inner hole of the shell, the bearings are located on the support ring and separated by a spacer sleeve, the outer wall of the inner sleeve is provided with an annular table which is located between the two sets of bearings, the inner holes of the inner sleeve are provided with a plurality of clamping grooves, the depth of the clamping grooves is gradually increased from the inner end to the outer end of the inner sleeve, each clamping groove corresponds to a trough of an expansion pipe, the clamping block is inserted into the clamping grooves and the troughs of the corresponding expansion pipes, and the clamping blocks fixedly connect the expansion pipes with the inner sleeve.
According to the method for vertically butting and lowering the expansion pipe, the number of the clamping blocks is not less than two, the clamping blocks are arranged pairwise and symmetrically by taking the expansion pipe as a center, the contact surfaces of the clamping blocks and the clamping grooves are inclined planes, the contact surfaces of the clamping blocks and the expansion pipe are vertical planes, the large end of each clamping block is provided with the fixing block, one side of each fixing block is fixed to the large end of each clamping block through a screw, and the other side of each fixing block is fixed to the inner sleeve through a screw.
According to the method for vertically butting and lowering the expansion pipe, the end part of the shell is fixedly provided with the gland, the end surface of the inner sleeve protrudes out of the end surface of the gland, the end surface of the inner sleeve is provided with an end surface groove, and the position of the end surface groove corresponds to the clamping groove; the gland is fixed with a torsion transmission pin mounting block, a torsion transmission pin is inserted into the torsion transmission pin mounting block, and one end of the torsion transmission pin is inserted into the wave trough of the outer wall of the expansion pipe through the end face groove.
According to the method for vertically butting and lowering the expansion pipe, the rubber layer is arranged on the contact surface of the fixture block and the expansion pipe, and the rubber layer is tightly attached to the wave trough of the expansion pipe.
According to the method for vertically butting and lowering the expansion pipe, the lifting mechanism is provided with the lifting hook, and the lifting hook can rotate 360 degrees.
According to the method for vertically butting and lowering the expansion pipe, the positioner is provided with a motor, a transmission piece, a rotating outer sleeve and a supporting sleeve, the lower part of the supporting sleeve is fixed with the fixed station, the rotating outer sleeve is sleeved on the upper part of the supporting sleeve, and the motor drives the rotating outer sleeve to rotate through the transmission piece; the upper portion of lower expansion pipe anchor clamps is fixed with rotatory overcoat, and lower expansion pipe anchor clamps are equipped with the toper through-hole, and the sleeve pipe slips matches and installs in the toper through-hole, and the sleeve pipe slips centre gripping expansion pipe.
According to the method for vertically butting and lowering the expansion pipe, the centering device bracket is fixed on the upper part of the clamp seat.
According to the method, a fixed table is built at a wellhead, a position changing machine and a welding robot are installed on the fixed table, the position changing machine is used as a power source for driving a lower expansion pipe to rotate, a lifting device for lifting the expansion pipe is arranged at the upper part of the position changing machine, after the upper expansion pipe and the lower expansion pipe are accurately butted through a centering device, a pipe body rotates and is matched with the welding robot to realize circumferential 360-degree welding of the butted expansion pipe. Compared with the prior art, the method can improve the welding efficiency of the expansion pipe, ensure the stability of the welding effect, and has more outstanding advantages when the hull is always in a fluctuating state under the action of sea waves particularly for offshore operation. The centering device designed according to the appearance characteristics of the quincunx expansion pipe can accurately and rigidly connect the upper expansion pipe and the lower expansion pipe and can assist in realizing the circumferential 360-degree welding of the expansion pipes. The method has the characteristics of low investment cost, high working efficiency and easy implementation.
Drawings
FIGS. 1-4 are schematic illustrations of the process of the invention;
FIG. 5 is a cross-sectional view of the centering device;
FIG. 6 is a perspective view of the centering device;
FIG. 7 is a top view of the centering device;
FIG. 8 is a perspective view of the inner sleeve;
FIG. 9 is a schematic perspective view of a latch;
fig. 10 is a sectional view of the cartridge.
The list of labels in the figure is: 1. the device comprises a lifting mechanism, 2, an upper expansion pipe, 3, a safety slip, 4, a centering device bracket, 5, a centering device, 5-1, a shell, 5-2, a bearing, 5-3 and a spacer sleeve; 5-4 parts of a fixture block, 5-4-1 parts of a fixture block, 5-4-2 parts of a rubber layer, 5-5 parts of an inner sleeve, 5-5-1 parts of a clamping groove, 5-5-2 parts of an end surface groove, 5-6 parts of a gland, 5-7 parts of a support ring, 5-8 parts of a torque transmission pin, 5-9 parts of a torque transmission pin mounting block, 5-10 parts of a welding window, 6 parts of a welding robot, 7 parts of a fixing table; 8. the device comprises a lower expansion pipe, 9 parts of a positioner, 9-1 parts of a support sleeve, 9-2 parts of a motor, 9-3 parts of a rotating part, 9-4 parts of a rotating outer sleeve, 10 parts of a lower expansion pipe clamp, 11 parts of a sleeve slips.
Detailed Description
According to the method, a fixed table is built at a wellhead into which an expansion pipe needs to be put, a positioner and a welding robot are installed on the fixed table, a lower expansion pipe clamp is installed on the positioner, and the lower expansion pipe is supported by the lower expansion pipe clamp through a sleeve slip; the upper part of the positioner is provided with a lifting mechanism for lifting the upper expansion pipe, the upper expansion pipe and the lower expansion pipe are accurately butted and fixed by using the centering device, the positioner drives the expansion pipe and the centering device to rotate, and the welding robot realizes the circumferential 360-degree welding of the butted expansion pipes in the rotating process.
The section of the expansion pipe is plum blossom-shaped, and a plurality of wave crests and wave troughs are uniformly distributed on the outer wall of the expansion pipe along the axial direction. Referring to fig. 5-10, the centering device is designed for the shape of the expansion tube. The centering device is provided with a shell 5-1, the shell is in a three-section type, the upper section and the lower section of the shell are cylindrical, the middle section of the shell is in an arc groove shape, a welding window is arranged in the middle section of the shell, and the butt joint position of the upper expansion pipe 4 and the lower expansion pipe 8 at the welding window is exposed. The inner holes of the upper section and the lower section of the shell are stepped holes, and the two sets of clamping mechanisms are symmetrically arranged on the upper section and the lower section of the shell. Each set of clamping mechanism is respectively provided with two sets of bearings 5-2, an inner sleeve 5-5, a clamping block 5-4 and a support ring 5-7. The support ring is pressed on the step of the inner hole of the shell, the bearings are positioned on the support ring, and the two sets of bearings are separated by a spacing sleeve 5-3. The outer wall of the inner sleeve is provided with an annular table which is positioned between the two sets of bearings so as to realize axial limit of the inner sleeve. The inner hole of the inner sleeve is provided with a plurality of clamping grooves 5-5-1, the depth of each clamping groove increases from the inner side end to the outer side end of the inner sleeve, and each clamping groove corresponds to the wave trough of one expansion pipe. The end surface of the inner sleeve is provided with an end surface groove 5-5-2, and the position of the end surface groove corresponds to the position of the clamping groove. The clamping blocks 5-4 are inserted between the clamping grooves and the corresponding wave troughs of the expansion pipe, the number of the clamping blocks is not less than two, the clamping blocks are pairwise combined and symmetrically installed by taking the expansion pipe as the center, and the radial position of the expansion pipe is adjusted by the up-and-down movement of the clamping blocks in the clamping grooves, so that the centering effect of the expansion pipe is adjusted. The fixture block is wedge-shaped, the contact surface of the fixture block and the clamping groove is an inclined surface matched and attached with the clamping groove, the contact surface of the fixture block and the expansion pipe is a vertical surface, and a rubber layer 5-4-2 is arranged on the contact surface of the fixture block and the expansion pipe. The big end of the fixture block is provided with a fixed block 5-4-1, the fixed block is positioned in the end surface groove, one side of the fixed block is fixed at the big end of the fixture block through a screw, and the other side of the fixed block is fixed with the inner sleeve through a screw. After the clamping block is tightly inserted, the expansion pipe can be fixed with the inner sleeve. In order to realize the circumferential limit of the centering device on the expansion pipe, the centering device is also provided with a torsion transmission pin. As shown in fig. 5-7, a gland 5-6 is fixed at the end part of the shell, the end surface of the inner sleeve protrudes out of the end surface of the gland, a torsion transmission pin mounting block 5-9 is fixed on the gland, a transverse hole is arranged on the torsion transmission pin mounting block, a torsion transmission pin 5-8 penetrates through the transverse hole, one end of the torsion transmission pin is inserted into the wave trough of the outer wall of the expansion pipe through an end surface groove, and the central line of the torsion transmission pin is superposed with the radial central line of the centering device. After the torsion transmission pin is inserted, the centering device can synchronously rotate with the expansion pipe.
The method of the invention is described in detail below with reference to the accompanying drawings:
1. and (3) equipment installation and fixation: referring to fig. 1, a fixed platform 7 is built at a wellhead where an expansion pipe needs to be put in; then, the positioner 9 is arranged on the fixed table, the welding robot 6 is arranged on the fixed table and is positioned beside the positioner, and the welding robot is a six-degree-of-freedom articulated welding robot. The positioner is used for driving the expansion pipe to rotate, and is provided with a motor 9-2, a transmission piece 9-3, a rotating outer sleeve 9-4 and a supporting sleeve 9-1, wherein the lower part of the supporting sleeve is fixed with the fixed platform, the rotating outer sleeve is sleeved on the upper part of the supporting sleeve, and the motor drives the rotating outer sleeve to rotate through the transmission piece. The lower expansion pipe clamp 10 is assembled in the supporting sleeve, the top flanging part of the lower expansion pipe clamp is in spiral connection with the rotating sleeve, the inner hole of the lower expansion pipe clamp is a conical hole, and a bearing is arranged between the lower expansion pipe clamp and the supporting sleeve.
2. Lowering a lower expansion pipe: referring to fig. 2, the safety slip 3 is fixed at the upper end of the lower expansion pipe 8, then the traction piece of the lifting mechanism is fixed to a position below the safety slip, the lower expansion pipe is lifted and lowered into the lower expansion pipe clamp, and the lower expansion pipe is lowered to a position where the welding seam meets the welding requirement of the welding robot and can be stopped. After the lower expansion pipe is in place, a casing slip 11 is placed between the lower expansion pipe clamp and the lower expansion pipe, the lower expansion pipe is clamped tightly by the casing slip, the outer conical surface of the casing slip is matched and attached with the conical hole of the lower expansion pipe clamp, and then the traction piece of the lifting mechanism is loosened. The upper part of the lower expansion pipe clamp is provided with a centering device support 4, the lower part of the centering device support is provided with a plurality of supporting legs, and the space between the supporting legs can be used for fastening or loosening the casing slip. The above described safety slips and casing slips are prior art.
3. The centering device is fixed with the lower expansion pipe: referring to fig. 3, the centering device 5 and the lower expansion pipe are coaxially lowered, the direction of the welding window 5-10 is adjusted to correspond to the welding position of the welding robot, the fixture block is inserted between the inner sleeve positioned at the lower part of the centering device and the lower expansion pipe, the fixture block is fixed by a bolt after being tightly inserted, and the centering device is fixed with the lower expansion pipe.
4. The centering device is fixed with the upper expansion pipe: referring to fig. 4, the upper expansion pipe is provided with a safety slip 3, the lifting mechanism lifts the upper expansion pipe 2 to be placed at the upper end of the lower expansion pipe, the lifting mechanism is provided with a lifting hook, and the lifting hook can rotate 360 degrees. After the wave crest and trough positions of the upper expansion pipe and the lower expansion pipe are adjusted to correspond to each other, the fixture block is inserted between the inner sleeve at the upper part of the centering device and the upper expansion pipe, the relative positions of the wave crest and the trough of the upper expansion pipe and the lower expansion pipe are adjusted while inserting, the fixture block is locked with the inner sleeve at the upper part through a bolt after the adjustment and the alignment, and the upper expansion pipe is fixed with the centering device. And inserting a torque transmission key, and locking the centering device and the upper and lower expansion pipes.
5. Welding an upper expansion pipe and a lower expansion pipe: through the relative motion of program control welding robot and machine of shifting, the motion direction of welding process welding robot is opposite with the rotation direction of expansion pipe, and 360 rotations are done to the expansion pipe under the drive of machine of shifting, and welding robot welds at certain angular range. When the centering device and the expansion pipe synchronously rotate for a certain angle, the welding window is about to deviate from the welding area, the positioner stops rotating, the torque transmission key is pulled out, the shell is pushed to reversely rotate to the welding window to correspond to the welding robot again, the torque transmission pin is inserted, and the positioner is started to continue welding until the whole circumference of the expansion pipe is completely welded.
6. And (3) lowering the expansion pipe which is welded: after the welding is finished, the casing slips, the safety slips and the fixture blocks of the centering device are removed in sequence, the centering device is made to fall on the centering device support 4, the welded expansion pipe string is placed into the well, the casing slips are placed again after the upper expansion pipe is placed at the welding position, the expansion pipe body is clamped, and the 4 th step and the 5 th step are repeated to continue welding.
Claims (8)
1. The method for vertically butting and lowering the expansion pipe is characterized by comprising the following steps of:
a. equipment installation: a fixed table is built at a wellhead into which an expansion pipe needs to be put, a rotating body and a welding robot are installed on the fixed table, the welding robot is located beside a position changing machine, a lower expansion pipe clamp is assembled on the position changing machine, a lifting mechanism is arranged on the upper portion of the position changing machine, and the lifting center of the lifting mechanism is coaxial with the rotating center of the position changing machine;
b. lowering a lower expansion pipe: the lifting mechanism lifts the lower expansion pipe, the lower expansion pipe is lowered into the well through the lower expansion pipe clamp, the upper portion of the lower expansion pipe corresponds to the welding height position of the welding robot, the lower expansion pipe is clamped by the casing slip, and the casing slip is supported by the lower expansion pipe clamp;
c. the centering device is fixed with the lower expansion pipe: sleeving a centering device on the upper part of the lower expansion pipe, wherein the centering device is provided with a shell, a welding window is arranged on the shell, the welding window of the centering device corresponds to the welding robot, clamping mechanisms are respectively arranged at the upper part and the lower part in the shell of the centering device, the upper part of the lower expansion pipe is clamped by the clamping mechanism positioned at the lower part, and the rotation of the lower expansion pipe relative to the centering device is limited by a torque transmission pin;
d. the centering device is fixed with the upper expansion pipe: the lifting mechanism lifts the upper expansion pipe and puts the upper end of the lower expansion pipe through the centering device, the wave crest and wave trough positions of the upper expansion pipe and the lower expansion pipe correspond to each other, the clamping mechanism positioned at the upper part clamps the lower part of the upper expansion pipe and the torque transmission pin limits the rotation of the upper expansion pipe relative to the centering device;
e. welding an upper expansion pipe and a lower expansion pipe: starting a position changing machine to rotate, driving the upper expansion pipe, the lower expansion pipe and the centering device to synchronously rotate by the position changing machine, and welding the joint of the upper expansion pipe and the lower expansion pipe at the welding window by a welding robot; after the upper expansion pipe and the lower expansion pipe are welded for one section, the positioner stops rotating, the torsion transmission pin is pulled out, the torsion transmission pin is contacted to restrain the rotation of the upper expansion pipe and the lower expansion pipe relative to the centering device, the shell is pushed to rotate relative to the upper expansion pipe and the lower expansion pipe, the welding window corresponds to the welding robot again, the upper torsion transmission pin is inserted, the positioner is started again, the positioner drives the upper expansion pipe and the lower expansion pipe to rotate to continue welding, and the upper expansion pipe and the lower expansion pipe are welded until the whole circumferential seam of the upper expansion pipe and the lower expansion pipe are welded together;
f. and (3) lowering the expansion pipe which is welded: and d, after welding is finished, removing the clamping blocks of the upper clamping mechanism and the lower clamping mechanism, separating the upper expansion pipe and the lower expansion pipe from the centering device, dropping the centering device on a bracket of the centering device, putting the welded upper expansion pipe and the welded lower expansion pipe down, and repeating the step d and the step e until the upper expansion pipe is put down to a welding position to weld the next expansion pipe.
2. The expansion pipe vertical butt-joint lowering method according to claim 1, characterized in that: the section of the expansion pipe is in a quincunx shape, and a plurality of wave crests and wave troughs are uniformly distributed on the outer wall of the expansion pipe along the axial direction; the shell of the centering device is in a three-section type, the upper section and the lower section of the shell are cylindrical, inner holes of the upper section and the lower section of the shell are stepped holes, the middle section of the shell is in an arc groove shape, a welding window is arranged in the middle section of the shell, two sets of clamping mechanisms are respectively arranged on the upper section and the lower section of the shell, each set of clamping mechanism is respectively provided with two sets of bearings, an inner sleeve, a clamping block and a support ring, the support ring is in contact pressure with a step in the inner hole of the shell, the bearings are located on the support ring and separated by a spacer sleeve, the outer wall of the inner sleeve is provided with an annular table which is located between the two sets of bearings, the inner holes of the inner sleeve are provided with a plurality of clamping grooves, the depth of the clamping grooves is gradually increased from the inner end to the outer end of the inner sleeve, each clamping groove corresponds to a trough of an expansion pipe, the clamping block is inserted into the clamping grooves and the troughs of the corresponding expansion pipes, and the clamping blocks fixedly connect the expansion pipes with the inner sleeve.
3. The expansion pipe vertical butt-joint lowering method according to claim 2, characterized in that: the clamping block is at least two, the clamping blocks are arranged pairwise and symmetrically with the expansion pipe as the center, the contact surfaces of the clamping blocks and the clamping grooves are inclined planes, the contact surfaces of the clamping blocks and the expansion pipe are vertical surfaces, the large-end of each clamping block is provided with a fixing block, one side of each fixing block is fixed to the large-end of each clamping block through screws, and the other side of each fixing block is fixed to the inner sleeve through screws.
4. The expansion pipe vertical butt-joint lowering method according to claim 3, characterized in that: the end part of the shell is fixedly provided with a gland, the end surface of the inner sleeve protrudes out of the end surface of the gland, the end surface of the inner sleeve is provided with an end surface groove, and the position of the end surface groove corresponds to the clamping groove; the gland is fixed with a torsion transmission pin mounting block, a torsion transmission pin is inserted into the torsion transmission pin mounting block, and one end of the torsion transmission pin is inserted into the wave trough of the outer wall of the expansion pipe through the end face groove.
5. The expansion pipe vertical butt-joint lowering method according to claim 4, characterized in that: the contact surface of the fixture block and the expansion pipe is provided with a rubber layer, and the rubber layer is tightly attached to the wave trough of the expansion pipe.
6. The expansion pipe vertical butt-joint lowering method according to claim 5, characterized in that: the lifting mechanism is provided with a lifting hook which can rotate 360 degrees.
7. The expansion pipe vertical butt-joint lowering method according to claim 6, characterized in that: the positioner is provided with a motor, a transmission part, a rotating outer sleeve and a supporting sleeve, the lower part of the supporting sleeve is fixed with the fixed station, the rotating outer sleeve is sleeved on the upper part of the supporting sleeve, and the motor drives the rotating outer sleeve to rotate through the transmission part; the upper portion of lower expansion pipe anchor clamps is fixed with rotatory overcoat, and lower expansion pipe anchor clamps are equipped with the toper through-hole, and the sleeve pipe slips matches and installs in the toper through-hole, and the sleeve pipe slips centre gripping expansion pipe.
8. The expansion pipe vertical butt-joint lowering method according to claim 7, characterized in that: the centering device support is fixed on the upper portion of the clamp seat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110927770.0A CN113714670B (en) | 2021-08-13 | 2021-08-13 | Vertical butt joint lowering method for expansion pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110927770.0A CN113714670B (en) | 2021-08-13 | 2021-08-13 | Vertical butt joint lowering method for expansion pipe |
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| CN113714670A true CN113714670A (en) | 2021-11-30 |
| CN113714670B CN113714670B (en) | 2022-09-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114378524A (en) * | 2021-12-29 | 2022-04-22 | 中国原子能科学研究院 | Sleeving method of inner sleeve and outer sleeve |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113714670B (en) | 2022-09-13 |
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